Velvetey purple is our favourite colour so we picked it for the webbing colour. On a more practical note we decided on a ratchet system as seen below to secure the three layers (wool, building wrap, canvas) together at the base of the yurt platform.
Where the canvas ends you can see some white building wrap extending below. We will cut off the excess at some point and boat soup the exposed plywood platform.
Hopefully it keeps most of the bugs from crawling up.